Reinforced concrete construction especially adapted for concrete ships.



A. MACDONALD. v REINFORCED CONCRETE CONSTRUCTION ESPECIALLY ADAPTED FOR CONCRETE SHIPS APPLICATION FILED Nov. I. um.

Patented Apr. 30, 1918.

WITNES: j E jg INVENTOR.

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ALAN MACDONALD, OF SAN rRArIC'IsCo, CALIFORNIA, AssrenoR T0 sAn F ANCISCO SHIP BUILDING Co., or SAN FRANCISCO, CALIFORNIA, A CORPORATION OF GALI- FORNIA.

REINFORCED CONCRETE CONSTRUCTION ESPECIALLY ADAPTED FOR CONCRETE SHIPS.

Specification of Letters Patent.

Patented Apr. 3C, I918.

Application filed November 1, 1917. Serial No. 199,621.

fully describe, by reference to the accom-.

panying drawings, in which Figure 1 is a sectional view, broken, of the side and bottom of a concrete ship showing my improved stirrups in connection with the main reinforcement of the walls and beams.

Fig. 2 is a detail of the side of the ship showing the wooden-forms and the manner of placing the stirrups.

Fig. 3 is a similar detail of the bottom of the ship.

Fig. 4 is a view of the two-part stirrup.

1 indicates the side and 2 the bottom of the ship, both formed of concrete. 3 are the beams of the side and 4 are the beams of the bottom. The side beams are horizontally disposed, and the bottom beams vertically disposed, as shown.

5 are the steel bars constituting the main reinforcement of the side wall, and 6 are the steel bars of the main reinforcement of the bottom. 7 and 8 are the steel bars of the side beams and bottom beams respectively.

9 are my improved steel stirrups. They aremade in'two separate parts or members, as seen 111 Fig. 4:. These are symmetrical and opposite, each member having extremities 10 at right angles to the body. At one end these members hook over the main reinforcing bars 5 and 6 in the side and bottom respectively and at the other end, the extremities 10 of the stirrup overlap and they hook over the bars 7 and 8 of the slde and bottom beams respectively. The advantage of these two part stirrups will be ment.

' ends.

understood in connection with their manner of placement, illustrated by Figs. 2 and 3. In Fig. 2, 11 indicates the wooden forms, WhlCll at the top of the side beam 3 are left open to pour the concrete. In Fig. 3, 12 shows the wooden forms, which likewise at the top of the bottom beam 4 are left open for the concrete. By splitting or halvlng the stirrups, I am enabled to carefully erect the beam steel, side Wall steel and bottom steel and then insert the split-stirrups at the sides. 7

It is customary in reinforced concrete construction of beams, to build forms, place the steel stirrups of the ordinary form which is a single bar bent to rectangular shape, with the extremities separated but adjacent at one end and then lay the main reinforce- This procedure is possible since these beam structures extend below the slab and the concrete is poured in from the top. In a concrete-ship, however, where the sides are vertical, the beams thereof being horizontal, and where the beams of the bottom are vertical and extend upwardly from said bottom, it is very difficult to install the common form of one-piece stirrup. Owing to the thinness of the walls and beams in concrete-ships, due to the necessity of keeping the weight down, it is imperative that the stirrups shall pass around and engage.

the steel bars of the sides and of the bottom, and the bars of the beams. In order to use the common form of stirrup in this connection, it would be necessary to first set the stirrup in engagement with the wall and bottom steel, after which the horizontal beam steel could be threaded in from the To do this would not only be expensive, but very diflicult, and probably would result in poor workmanship. But with my stirrup, the members can be readily inserted,

as I have herein described, thereby saving expense and making it possible to doa cheap and accurate job.

I claim In concrete construction and in combination with its vertical and horizontal walls, and the beams thereof extending therefrom horizontally and upwardly respectively, and

the main reinforcing bars of said walls and too beams, the two par]; stirrups comprising opname to this specification in the presence of posing memloei s w th benp ex t e nipies those two subscribing witnesses. at one Tend o ffithe Stirrup Engagi gthe re- T inforcing bars of the Walls and those at the ALAN MACDOA other end overlapping and engaging the re- Witnesses:

n sn ngebars oi; he 062 1 5 7 WM. F. Boom,

. In=:testimonywhereofil have-signed my D. B. RICHARDS.

copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

. Y Washington, D. 0. 

